test: replace "inspector-cli" with "debugger"

When I moved node-inspect into core, I called a lot of things
`inspector-cli` that really should have been `debugger`. This is the
last of them to be renamed.

PR-URL: https://github.com/nodejs/node/pull/39156


Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>